As of the census[1] of 2000, there were 451 people, 148 households, and 129 families residing in the township.

There were 154 housing units at an average density of 3.2 per square mile (1.2/km2).

10.8% of all households were made up of individuals, and 3.4% had someone living alone who was 65 years of age or older.

Martin Township is located in Minnesota's 1st congressional district, represented by Mankato educator Tim Walz, a Democrat.

At the state level, Martin Township is located in Senate District 22, represented by Republican Doug Magnus, and in House District 22A, represented by Republican Joe Schomacker.